(Warning: this is a math-y joke)
"There will be the coming of days. You believers will be integrated, you non-believers will be differentiated." He starts pointing at each passenger saying, "I integrate you! I differentiate you!" Everyone was scared but one man just sat there coolly with a grin on his face.
"Aren't you afraid?," said the crazy man. The other man chuckled and said, "Sir, I am not afraid. I am e^x."
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